Hi! As a shot I think the butterflies are pretty convincing. However, if you're asking for a critique on their actual animations then we need to see a close-up of your flight clip. But from this vantage point it looks like the butterflies in the right side are taking an odd path downwards, almost like they're quickly moving up and down as they descend. I think doing that but a tad more subtle would feel more realistic.

As I said, as a shot it's lookin' good; just a little nit-pick. Good luck!

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